DCN_rpj3

DCN_rpj3 - NT503: Data Communication & Networking OSI model...

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1 OSI model for computer communication
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2 Concept of Layering ± In order to simplify understanding and reduce design complexity, a network is conceptually visualized as a stack of various layers. ± Various network models are available using this type of layered architecture such as, ¾ Internet model ¾ OSI reference model ¾ TCP/IP model etc. ± Number of layers, names of layers, functions of layers may differ for different network models ± Modularity: Functions of each layer are distinct and and layers are independent of the others, allows for scalability (or future expansion)
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3 OSI model for computer communication ± Open System Interconnection (OSI) model was invented by International Standards Organization (ISO) ± Open system is a model that, ¾ allows two different systems to communicate regardless of their fundamental architecture ¾ establishes communication between different systems without requiring changes in the logic of basic hardware or software ± OSI is a reference model (not a protocol) ± Each layer uses and builds on the services provided by those below it ± OSI reference model consists of 7-layers ± Functions and services provided by each layer are clearly defined
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4 OSI model for computer communication
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5 Layer tasks: analogy of sending a letter
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6 Guidelines used for defining OSI layers ± A layer should be created when a different level of abstraction is needed. ± Each layer should have a well-defined function, no overlap ± Layer boundaries should be chosen to minimize the information flow across the interfaces. ± Number of layers should be large enough that distinct
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This note was uploaded on 07/15/2011 for the course ECO 2023 taught by Professor Mr.raza during the Summer '10 term at FAU.

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DCN_rpj3 - NT503: Data Communication & Networking OSI model...

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